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<p>[QUOTE=&quot;desertgem, post: 1518607, member: 15199&quot;]Amanda, conservation of any material does have the same philosophical intent, but often the details have to be derived for different types of materials. In many cases crossing over of conservation techniques from one area to another can have horrible consequences. The general conservationists of many 1800 to mid 1900 museums, including the nationally known ones in NY and Washington, often polished and damaged early coins as they didn&#039;t really understand the metals. Likewise a coin conservationist could think complete lack or air or moisture ( as for coins) should work for paper and cloth items, or even naturalist preparations of bones and skins. Of course we should know better now. However many store their paper money/stock certificates , etc the same as their coins, which have different consequences, but all bad. </p><p><br /></p><p>The vapor pressure of silver , gold, nickel, coin metals is basically 0 at normal temperatures ( they don&#039;t outgas), where as paper and natural organic based substance do. So for the first (coins) air tightness, near vacuum,&nbsp; zero humidity would be best. For natural or outgassing substances such as paper, clothing, a raccoon specimen requires varying ranges of temperature, and humidity. Paintings and even a few ceramic objects out gas and must be given consideration. </p><p><br /></p><p>Wood does out gas rather strongly. If you can smell a piece of unvarnished wood, it is out gassing. Tannic acid can affect coins and thus the wood and varnish/wax should be chosen for low reaction around coins that are not is an airtight container. As Doug said Mahogany is generally thought as the lowest emitter so that is what was used, but even it is much higher than most plastics. I know it is weird that so many sets are issued in wood containers, but ~ oh well.</p><p><br /></p><p>I do find a little humor in that I purchased a modern rendition of a coin cabinet at a club auction ( made by the Franklin mint for a long ago promotion) and no one else bid as they knew about wood/felt/ and coins. I am using it to store my crystal and gemstone collection <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie1" alt=":)" unselectable="on" unselectable="on" /> IMO.</p><p><br /></p><p>Jim[/QUOTE]</p><p><br /></p>

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